Dental alloy.



PTEN .onnion.

HENRY K. SANDELL, OF CHICAGO, ILLINOIS, ASSIGNOR TO'HERBERT S. MILLS, OF

CHICAGO, ILLINOIS.

DENTAL ALLOY.

No Drawing.

To all whom it may concern Be it known that I, HENR K. SANDELL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Dental Alloys, of which the following is a specification.

My invention relates to improvements in alloys particularly to an alloy especially designed as a substitute for platinum in the dental arts as, for example, for use as a rivet for fillings in false teeth.

My new alloy is prepared in the following manner:

10 parts by weight of tungsten is melted in an electric arc and to the molten mass there is added 7 parts by weight of nickel and 3 parts by weight of powdered graphitic carbon. ted to set, re-melted in an electric furnace and to it there is added 80 parts by weight of commercial gold as, for example, 18 carat gold. The alloy is nowcomplete.

The melting point of this alloy is appar- Speciflcation of Letters Patent.

This mixture or alloy is permit- Patented Jan. 1, 1918.

Application filed June 18, 1917. Serial No. 175,369.

ently about the same as that of platinum. Its tensile strength is high, it is malleable to such an extent as to make it adapted for most purposes, particularly in the dental art, for which platinum is now used, and it is not attacked by mineral acids.

That I claim is:

1. An alloy comprising 80 parts by weight of gold, 10 parts by weight of tungsten, 7 parts by weight of nickel and a relatively small proportion of carbon.

2. The method of alloying gold with tung-v sten and a lower melting-point metal which comprises, first, preparing an alloy of the tungsten and lower melting-point metal in an electric arc,-and subsequently alloying such primary alloy with gold.

3. The method of preparing an alloy of gold, tungsten and nickel, which comprises melting the tungsten, adding the nickel to the molten tungsten, and incorporating the primaryalloy thus produced in the molten gold.

HENRY K. SANDELL. 

